Android抽屉布局未显示

我是android开发新手。我试图实现一个抽屉布局，没有在构建错误，但抽屉汉堡包图标不显示。这里是我的XML布局Android抽屉布局未显示

<LinearLayout 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:tools="http://schemas.android.com/tools" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:orientation="vertical" 
     tools:context=".MainActivity"> 

     <android.support.v7.widget.Toolbar 
      android:id="@+id/toolbar" 
      android:layout_height="wrap_content" 
      android:layout_width="match_parent" 
      android:background="?attr/colorPrimary" 
      android:minHeight="?android:attr/actionBarSize" 
      /> 

     <android.support.v4.widget.DrawerLayout 
      android:id="@+id/drawer_layout" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent"> 

      <TextView 
       android:id="@+id/drawer" 
       android:text="@string/hello_world" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" /> 

      <ListView android:layout_width="240dp" 
       android:layout_height="match_parent" 
       android:layout_gravity="start" 
       /> 

     </android.support.v4.widget.DrawerLayout> 

    </LinearLayout>

MainActivity.java

package com.example.arslan.tutsplus02; 

import android.content.res.Configuration; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBarDrawerToggle; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.support.v7.widget.Toolbar; 
import android.view.View; 

public class MainActivity extends AppCompatActivity { 

    private DrawerLayout mDrawerLayout; 
    private ActionBarDrawerToggle mActionBarDrawerToggle; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     getSupportActionBar().setDisplayShowHomeEnabled(true); 
     getSupportActionBar().setHomeButtonEnabled(true); 

     mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
     mActionBarDrawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout,R.string.drawer_opened,R.string.drawer_closed) 
     { 
      @Override 
      public void onDrawerOpened(View drawerView) { 
       if (getSupportActionBar()!= null) { 
        getSupportActionBar().setTitle(R.string.drawer_opened); 
       } 
      } 

      @Override 
      public void onDrawerClosed(View drawerView) { 
       super.onDrawerClosed(drawerView); 
       if (getSupportActionBar()!= null) { 
        getSupportActionBar().setTitle(R.string.drawer_closed); 
       } 
      } 
     }; 
     mDrawerLayout.setDrawerListener(mActionBarDrawerToggle); 
    } 

    @Override 
    protected void onPostCreate(Bundle savedInstanceState) { 
     super.onPostCreate(savedInstanceState); 
     mActionBarDrawerToggle.syncState(); 

    } 

    @Override 
    public void onConfigurationChanged(Configuration newConfig) { 
     super.onConfigurationChanged(newConfig); 
     mActionBarDrawerToggle.onConfigurationChanged(newConfig); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 

     if (mActionBarDrawerToggle.onOptionsItemSelected(item)) 
     { 
      return true; 
     } 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 
}

感谢

来源

2015-11-27 user2431114

尝试将工具栏添加到您的ActionBarDrawerToggle中。

mActionBarDrawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout,toolbar,R.string.drawer_opened,R.string.drawer_closed) 
    { 
     @Override 
     public void onDrawerOpened(View drawerView) { 
      if (getSupportActionBar()!= null) { 
       getSupportActionBar().setTitle(R.string.drawer_opened); 
      } 
     } 

     @Override 
     public void onDrawerClosed(View drawerView) { 
      super.onDrawerClosed(drawerView); 
      if (getSupportActionBar()!= null) { 
       getSupportActionBar().setTitle(R.string.drawer_closed); 
      } 
     } 
    }; 
    mDrawerLayout.setDrawerListener(mActionBarDrawerToggle);

来源

2015-11-27 11:10:00

感谢它的工作原理。但为什么我有工具栏添加到ActionBarDrawerToggle如果不是在XML – user2431114

抽屉布局的一部分**这个类提供了一种方便的方法，以配合在一起DrawerLayout和功能框架ActionBar来实现推荐的抽屉设计。**检查进一步参考[link]（http://developer.android.com/reference/android/support/v7/app/ActionBarDrawerToggle.html） –

试着改变你的XML文件

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/drawer_layout" 
android:layout_width="match_parent" 
android:layout_height="match_parent"> 

<LinearLayout 
    android:id="@+id/main_content" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical"> 

    <android.support.v7.widget.Toolbar 
     android:id="@+id/toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:background="?attr/colorPrimary" 
     android:minHeight="?android:attr/actionBarSize" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/hello_world" /> 
</LinearLayout> 

<ListView 
    android:id="@+id/drawerList" 
    android:layout_width="240dp" 
    android:layout_height="match_parent" 
    android:layout_gravity="start" /> 

</android.support.v4.widget.DrawerLayout>

希望它可以帮助

来源

2015-11-27 11:08:20

Android抽屉布局未显示

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